Answer:
D
Explanation:
When a substance moves from low to high concentration it is moving against its concentration gradient, which requires more energy.
A. It depends on where it is moving, not the substance
OB. This is describing diffusion
OC. Does not require energy, it is passive transport through a semi-permeable membrane
Answer:
III
Explanation:
DNA polymerase can synthesize only a new DNA strand not m-RNA. It can do this in the 5’ to 3’ direction.
Answer:
b. 2
Explanation:
Each primary oocyte produces 4 daughter cells after meiosis. However, only one of those 4 cells is an ovum;the three remaining cells are called polar bodies. Polar bodies are not ovulated and therefore are not fertilized.
According to the above, if we have two primary oocytes, we will obtain two ova after meiosis.
The answer is A. One way for scientists to gather
information about operons in organisms
is by examining the genome sequence, such as by making use of the intergenic
distance between frames to count the number of operons there is in the genome.
Speciation can be difficult to observe in nature, but the it is hypothesized that the following occurs in a allopatric speciation's intermediate stage:
(1) closely related species are differentiated through geographic variation (2) then there's reduced fertility in one a geographic race of the species (3) and in the geographic race of subspecies that are to become species.
